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Orekhov N, Bukhtiiarova N, Brushevich ZA, Muravev AA, Nadav E, Tsarfati Y, Kossoy A, Feldman I, Zelenina A, Rubekina AA, Semenov SN, Skorb EV. Altering the structures of 3D supramolecular assemblies from melamine and cyanuric acid derivatives in water. Chem Commun (Camb) 2024. [PMID: 39171520 DOI: 10.1039/d4cc02817a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/23/2024]
Abstract
Herein, we obtained two supramolecular assemblies with layered structures from melamine, N-methylmelamine, and hexynyl-cyanuric acid in water. By combination of X-ray diffraction, electron microscopy, and molecular dynamics studies, we found that introducing one methyl group in melamine alters the arrangement of the layers in these structures.
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Affiliation(s)
- Nikita Orekhov
- Infochemistry Scientific Center, ITMO University, Saint Petersburg, Russia.
- Moscow Center for Advanced Studies, Moscow, Russia
| | - Nina Bukhtiiarova
- Infochemistry Scientific Center, ITMO University, Saint Petersburg, Russia.
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot, Israel.
| | - Zlata A Brushevich
- Infochemistry Scientific Center, ITMO University, Saint Petersburg, Russia.
| | - Anton A Muravev
- Infochemistry Scientific Center, ITMO University, Saint Petersburg, Russia.
| | - Elad Nadav
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel
| | - Yael Tsarfati
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot, Israel.
| | - Anna Kossoy
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel
| | - Isai Feldman
- Department of Chemical Research Support, Weizmann Institute of Science, Rehovot, Israel
| | | | | | - Sergey N Semenov
- Department of Molecular Chemistry and Materials Science, Weizmann Institute of Science, Rehovot, Israel.
| | - Ekaterina V Skorb
- Infochemistry Scientific Center, ITMO University, Saint Petersburg, Russia.
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2
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Hu S, Zhao H, Liang M, Hao J, Xue P. Interconversion and functional composites of metal-organic frameworks and hydrogen-bonded organic frameworks. Chem Commun (Camb) 2024; 60:8140-8152. [PMID: 39028023 DOI: 10.1039/d4cc01875c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
Metal-organic frameworks (MOFs), an emerging class of highly ordered crystalline porous materials, possess structural tunability, high specific surface area, well-defined pores, and diverse pore environments and morphologies, making them suitable for various potential applications. Moreover, hydrogen-bonded organic frameworks (HOFs), constructed from organic molecules with complementary hydrogen-bonding patterns, are rapidly evolving into a novel category of porous materials due to their facile mild preparation conditions, solution processability, easy regeneration capability, and excellent biocompatibility. These distinctive advantages have garnered significant attention across diverse fields. Considering the inherent binding affinity between MOFs and HOFs along with the fact that many MOF linkers can serve as building blocks for constructing HOFs, their combination holds promise in creating functional materials with enhanced performance. This feature paper provides an introduction to the interconversion between MOFs and HOFs followed by highlighting the emerging applications of MOF-HOF composites. Finally, we briefly discuss the current challenges associated with future perspectives on MOF-HOF composites.
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Affiliation(s)
- Siwen Hu
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, No. 393, Binshui West Road, Tianjin, 300387, P. R. China.
| | - He Zhao
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, No. 393, Binshui West Road, Tianjin, 300387, P. R. China.
| | - Meng Liang
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, No. 393, Binshui West Road, Tianjin, 300387, P. R. China.
| | - Jingjun Hao
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, No. 393, Binshui West Road, Tianjin, 300387, P. R. China.
| | - Pengchong Xue
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry, Tianjin Normal University, No. 393, Binshui West Road, Tianjin, 300387, P. R. China.
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3
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Yang W, Mo Q, He QT, Li XP, Xue Z, Lu YL, Chen J, Zheng K, Fan Y, Li G, Su CY. Anion Modulation of Ag-Imidazole Cuboctahedral Cage Microenvironments for Efficient Electrocatalytic CO 2 Reduction. Angew Chem Int Ed Engl 2024; 63:e202406564. [PMID: 38766872 DOI: 10.1002/anie.202406564] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2024] [Revised: 05/20/2024] [Accepted: 05/20/2024] [Indexed: 05/22/2024]
Abstract
How to achieve CO2 electroreduction in high efficiency is a current challenge with the mechanism not well understood yet. The metal-organic cages with multiple metal sites, tunable active centers, and well-defined microenvironments may provide a promising catalyst model. Here, we report self-assembly of Ag4L4 type cuboctahedral cages from coordination dynamic Ag+ ion and triangular imidazolyl ligand 1,3,5-tris(1-benzylbenzimidazol-2-yl) benzene (Ag-MOC-X, X=NO3, ClO4, BF4) via anion template effect. Notably, Ag-MOC-NO3 achieves the highest CO faradaic efficiency in pH-universal electrolytes of 86.1 % (acidic), 94.1 % (neutral) and 95.3 % (alkaline), much higher than those of Ag-MOC-ClO4 and Ag-MOC-BF4 with just different counter anions. In situ attenuated total reflection Fourier transform infrared spectroscopy observes formation of vital intermediate *COOH for CO2-to-CO conversion. The density functional theory calculations suggest that the adsorption of CO2 on unsaturated Ag-site is stabilized by C-H⋅⋅⋅O hydrogen-bonding of CO2 in a microenvironment surrounded by three benzimidazole rings, and the activation of CO2 is dependent on the coordination dynamics of Ag-centers modulated by the hosted anions through Ag⋅⋅⋅X interactions. This work offers a supramolecular electrocatalytic strategy based on Ag-coordination geometry and host-guest interaction regulation of MOCs as high-efficient electrocatalysts for CO2 reduction to CO which is a key intermediate in chemical industry process.
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Affiliation(s)
- Wenqian Yang
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Qijie Mo
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Qi-Ting He
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Xiang-Ping Li
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Ziqian Xue
- School of Advanced Energy, Sun Yat-Sen University, 518107, Shenzhen, China
| | - Yu-Lin Lu
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Jie Chen
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Kai Zheng
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Yanan Fan
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Guangqin Li
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
| | - Cheng-Yong Su
- MOE Laboratory of Bioinorganic and Synthetic Chemistry, GBRCE for Functional Molecular Engineering, LIFM, IGCME, School of Chemistry, Sun Yat-Sen University, 510275, Guangzhou, China
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4
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He C, Shang L, Zhu H, Yu L, Wang L, Zhang J. Photocatalytic Conversion of Methane to Ethanol at a Three-Phase Interface with Concentration-Matched Hydroxyl and Methyl Radicals. J Am Chem Soc 2024; 146:11968-11977. [PMID: 38630990 DOI: 10.1021/jacs.4c01366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/19/2024]
Abstract
The direct oxidation of CH4 to C2H5OH is attractive but challenging owing to the intricate processes involving carbon-chain growth and hydroxylation simultaneously. The inherent difficulty arises from the strong tendency of CH4 to overoxidize in the commonly used pressurized powder suspension systems rich in reactive oxygen radicals (ROR), which are specifically designed for CH4 concentration and activation. Meanwhile, the strong tendency of nucleophilic attack of potent ROR on the C-C bond of the resulting product C2H5OH ultimately leads to a higher selectivity for C1 oxygenates. This study addresses this multifaceted issue by designing a three-phase interface based on a hydrophilic floating Fe(III)-cross-linked macroporous alginate hydrogel film encapsulated with C3N4 [Fe(III)@ACN] to simultaneously enhance the accessibility of H2O and CH4 molecules to the active sites and species within the macroporous channel. The hydrophilic properties of Fe(III)@ACN allow the in situ production of H2O2 from C3N4 through the water oxidation reaction under irradiation. The concurrent photoinduced Fe(II) triggers Fenton reaction with H2O2 to produce •OH. The enhanced mass transfer of CH4 at the three-phase interface ensures the efficient formation of •CH3 by reacting with •OH, ultimately facilitating carbon-chain growth in the conversion pathway from CH4 to CH3OH and finally to C2H5OH with •CH3 and •OH present in comparable concentrations. Thus, the Fe(III)@ACN catalyst exhibits a remarkable 96% selectivity for alcohol, achieving a 90% selectivity for C2H5OH in the alcohol products. The C2H5OH production rate reaches 171.7 μmol g-1 h-1 without the need for precious-metal additive.
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Affiliation(s)
- Chun He
- Key Laboratory for Advanced Materials, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, Shanghai Engineering Research Center for Multimedia Environmental Catalysis and Resource Utilization, East China University of Science & Technology, Shanghai 200237, China
| | - Lan Shang
- Key Laboratory for Advanced Materials, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, Shanghai Engineering Research Center for Multimedia Environmental Catalysis and Resource Utilization, East China University of Science & Technology, Shanghai 200237, China
| | - Hongfu Zhu
- Key Laboratory for Advanced Materials, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, Shanghai Engineering Research Center for Multimedia Environmental Catalysis and Resource Utilization, East China University of Science & Technology, Shanghai 200237, China
| | - Lianchao Yu
- Key Laboratory for Advanced Materials, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, Shanghai Engineering Research Center for Multimedia Environmental Catalysis and Resource Utilization, East China University of Science & Technology, Shanghai 200237, China
| | - Lingzhi Wang
- Key Laboratory for Advanced Materials, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, Shanghai Engineering Research Center for Multimedia Environmental Catalysis and Resource Utilization, East China University of Science & Technology, Shanghai 200237, China
| | - Jinlong Zhang
- Key Laboratory for Advanced Materials, Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, School of Chemistry and Molecular Engineering, Shanghai Engineering Research Center for Multimedia Environmental Catalysis and Resource Utilization, East China University of Science & Technology, Shanghai 200237, China
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5
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Meng H, Meng P, Liu Z, McMurtrie J, Xu J. Exclusive Coordination between Melem and Silver(I) Ions: From Irregular Aggregates to Nanofibers to Crystal Cubes. Inorg Chem 2024; 63:6980-6987. [PMID: 38565220 DOI: 10.1021/acs.inorgchem.4c00507] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2024]
Abstract
There is growing focus on metal-free molecules and polymers owing to their potential applications in various energy and catalysis-related applications. Melem (2,5,8-triamino-s-heptazine, C6H6N10) has emerged as a metal-free material for solar-to-fuel conversion. However, its reactivity with metal ions or organic molecules has never been reported although it possesses multiple supramolecular interaction sites. In this work, we report on the synthesis of a novel metal-organic coordination framework (melem-Ag) by simply introducing Ag+ into the aqueous suspension of aggregated melem particles. Notably, as the reaction progresses, the melem disappears, and the morphology of the newly formed complex spontaneously evolves from nanofibers to single-crystalline blocks, which possess the same chemical structure, indicating that the morphology evolution is driven by Ostwald ripening. The structure of melem-Ag displays infinite nanocages of triangular pyramids consisting of melem molecules and Ag+, linked via Ag-N coordinate bonding and Ag-Ag argentophilic interactions. It is noteworthy that Ag+ is the only transition-metal cation that reacts with melem suspensions, even in the presence of other transition-metal cations (Co2+, Ni2+, Cu2+, and Zn2+). The coordination of Ag+ to melem results in metal-to-ligand charge transfer (MLCT), resulting in a quenched photoluminescence and enhanced light absorption. Exposing the melem-Ag crystals to UV light for varying time intervals results in the formation of colorful powders, which may be used for Ag-decorated photocatalysts.
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Affiliation(s)
- Hang Meng
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Peng Meng
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Zixuan Liu
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - John McMurtrie
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
| | - Jingsan Xu
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, QLD 4000, Australia
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6
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Lupa-Myszkowska M, Oszajca M, Matoga D. From non-conductive MOF to proton-conducting metal-HOFs: a new class of reversible transformations induced by solvent-free mechanochemistry. Chem Sci 2023; 14:14176-14181. [PMID: 38098718 PMCID: PMC10718065 DOI: 10.1039/d3sc04401g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Accepted: 11/24/2023] [Indexed: 12/17/2023] Open
Abstract
Proton-conducting materials play an important role as solid electrolytes in electrochemical devices for energy storage and conversion, including proton exchange membrane fuel cells. Metal-organic frameworks (MOFs), covalent-organic frameworks (COFs) and more recently hydrogen-bonded organic frameworks (HOFs) have emerged as useful crystalline platforms for proton transport that provide high conductivity and enable insight into conduction pathways. Here, we present two new HOFs with high conductivity, reaching 2 × 10-2 S cm-1 at 60 °C and 75% relative humidity, obtained in reactions that represent a new class of reversible transformations of solids. The reactions are induced by solvent-free mechanochemistry and involve breaking of coordination linkages in a MOF and formation of extended hydrogen-bonded networks of metal-HOFs (MHOFs). This unprecedented class of MOF-to-MHOF transformations has been demonstrated using a non-conductive MOF (JUK-1) and formamidinium or methylammonium thiocyanates as solid reactants. Structural details of the solid-state reactions are revealed by powder X-ray diffraction and Rietveld refinements for the MHOF products. None of the attempts using conventional methods were successful in obtaining the MHOFs, emphasizing a unique role of mechanochemical stimuli in the reactivity of supramolecular polymer solids, including crystalline MOFs and HOFs. The reversible nature of non-covalent interactions in such materials may be utilized for the development of healable polymer systems.
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Affiliation(s)
- Magdalena Lupa-Myszkowska
- Faculty of Chemistry, Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
- Doctoral School of Exact and Natural Sciences, Jagiellonian University ul. prof. S. Łojasiewicza 11 30-348 Kraków Poland
| | - Marcin Oszajca
- Faculty of Chemistry, Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
| | - Dariusz Matoga
- Faculty of Chemistry, Jagiellonian University Gronostajowa 2 30-387 Kraków Poland
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7
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Xu L, Hu Y, Zhao D, Zhang W, Wang H. A Versatile Assembly Approach toward Multifunctional Supramolecular Poly(Ionic Liquid) Nanoporous Membranes in Water. Macromol Rapid Commun 2023; 44:e2300189. [PMID: 37248809 DOI: 10.1002/marc.202300189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Revised: 05/25/2023] [Indexed: 05/31/2023]
Abstract
Hydrogen (H)-bonding-integration of multiple ingredients into supramolecular polyelectrolyte nanoporous membranes in water, thereby achieving tailor-made porous architectures, properties, and functionalities, remains one of the foremost challenges in materials chemistry due to the significantly opposing action of water molecules against H-bonding. Herein, a strategy is described that allows direct fusing of the functional attributes of small additives into water-involved hydrogen bonding assembled supramolecular poly(ionic liquid) (PIL) nanoporous membranes (SPILMs) under ambient conditions. It discloses that the pore size distributions and mechanical properties of SPILMs are rationally controlled by tuning the H-bonding interactions between small additives and homo-PIL. It demonstrates that, benefiting from the synergy of multiple noncovalent interactions, small dye additives/homo-PIL solutions can be utilized as versatile inks for yielding colorful light emitting films with robust underwater adhesion strength, excellent stretchability, and flexibility on diverse substrates, including both hydrophilic and hydrophobic surfaces. This system provides a general platform for integrating the functional attributes of a diverse variety of additives into SPILMs to create multifunctional and programmable materials in water.
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Affiliation(s)
- Luyao Xu
- Key Laboratory of Functional Polymer Materials of the Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Yingyi Hu
- Key Laboratory of Functional Polymer Materials of the Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Dongbing Zhao
- State Key Laboratory and Institute of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Wangqing Zhang
- Key Laboratory of Functional Polymer Materials of the Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
| | - Hong Wang
- Key Laboratory of Functional Polymer Materials of the Ministry of Education, Institute of Polymer Chemistry, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China
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Jiao Y, Chen B, Zhong C, Hou X, Fu Y, Fan F, Wang T, Fu Y. Fabrication of a self-standing supramolecular membrane by a "soft spray" technique. Chem Commun (Camb) 2023; 59:4197-4200. [PMID: 36919779 DOI: 10.1039/d3cc00158j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/09/2023]
Abstract
We report a one-step method to fabricate a free-standing supramolecular membrane composed of melamine and barbituric acid coordinated with silver nitrate (Mba-Ag) at the gas/liquid interface by a soft spray technique. MBa-Ag exhibits a folded two-dimensional layered morphology and thickness of 4.5 μm. The shortwave IR transmittance of MBa-Ag is as high as 95%, which is much higher than the transmittance of UV and visible light, and has the potential for electromagnetic wave transmission.
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Affiliation(s)
- Yonghua Jiao
- College of Life and Health Sciences, Northeastern University, Shenyang 110819, P. R. China.
| | - Bingbing Chen
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, P. R. China. .,Ningxia Institute of Science and Technology, Shizuishan, 753000, P. R. China.
| | - Chaofan Zhong
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, P. R. China.
| | - Xiaojiao Hou
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, P. R. China.
| | - Yuanlin Fu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, P. R. China.
| | - Fuqiang Fan
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, P. R. China.
| | - Tieqiang Wang
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, P. R. China.
| | - Yu Fu
- Department of Chemistry, College of Sciences, Northeastern University, Shenyang, 110819, P. R. China.
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Cai ZX, Xia Y, Ito Y, Ohtani M, Sakamoto H, Ito A, Bai Y, Wang ZL, Yamauchi Y, Fujita T. General Synthesis of MOF Nanotubes via Hydrogen-Bonded Organic Frameworks toward Efficient Hydrogen Evolution Electrocatalysts. ACS NANO 2022; 16:20851-20864. [PMID: 36458840 DOI: 10.1021/acsnano.2c08245] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
The application scope of metal-organic frameworks (MOFs) can be extended by rationally designing the architecture and components of MOFs, which can be achieved via a metal-containing solid templated strategy. However, this strategy suffers from low efficiency and provides only one specific MOF from one template. Herein, we present a versatile templated strategy in which organic ligands are weaved into hydrogen-bonded organic frameworks (HOFs) for the controllable and scalable synthesis of MOF nanotubes. HOF nanowires assembled from benzene-1,3,5-tricarboxylic acid and melamine via a simple sonochemical approach serve as both the template and precursor to produce MOF nanotubes with varied metal compositions. Hybrid nanotubes containing nanometal crystals and N-doped graphene prepared through a carbonization process show that the optimized NiRuIr alloy@NG nanotube exhibits excellent electrocatalytic HER activity and durability in alkaline media, outperforming most reported catalysts. The strategy proposed here demonstrates a pioneering study of combination of HOF and MOF, which shows great potential in the design of other nanosized MOFs with various architectures and compositions for potential applications.
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Affiliation(s)
- Ze-Xing Cai
- School of Environmental Science and Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada, Kami, Kochi782-8502, Japan
- School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang464000, P.R. China
| | - Yanjie Xia
- School of Physics and Electronic Engineering, Xinyang Normal University, Xinyang464000, P.R. China
| | - Yoshikazu Ito
- Institute of Applied Physics, Graduate School of Pure and Applied Sciences, University of Tsukuba, Tsukuba305-8573, Japan
| | - Masataka Ohtani
- School of Environmental Science and Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada, Kami, Kochi782-8502, Japan
| | - Hikaru Sakamoto
- School of Environmental Science and Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada, Kami, Kochi782-8502, Japan
| | - Akitaka Ito
- School of Environmental Science and Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada, Kami, Kochi782-8502, Japan
| | - Yijia Bai
- Chemical Engineering College, Inner Mongolia University of Technology, No. 49 Aimin Street, Hohhot010051, P.R. China
- Key Laboratory of CO2 Resource Utilization at Universities of Inner Mongolia Autonomous Region, No. 49 Aimin Street, Hohhot010051, P.R. China
| | - Zhong-Li Wang
- Tianjin Key Laboratory of Applied Catalysis Science & Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin300072, P.R. China
| | - Yusuke Yamauchi
- JST-ERATO Yamauchi Materials Space Tectonics Project and International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), 1-1 Namiki, Tsukuba, Ibaraki305-0044, Japan
- School of Chemical Engineering and Australian Institute for Bioengineering and Nanotechnology (AIBN), The University of Queensland, Brisbane, Queensland4072, Australia
| | - Takeshi Fujita
- School of Environmental Science and Engineering, Kochi University of Technology, 185 Miyanokuchi, Tosayamada, Kami, Kochi782-8502, Japan
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10
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Zhang A, Guo Y, Xie H, Zhang Y, Fu Y, Ye C, Du Y, Zhu M. Green and controllable synthesis of kelp-like carbon nitride nanosheets via an ultrasound-mediated self-assembly strategy. J Colloid Interface Sci 2022; 628:397-408. [PMID: 35932676 DOI: 10.1016/j.jcis.2022.07.169] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 07/24/2022] [Accepted: 07/27/2022] [Indexed: 11/24/2022]
Abstract
The application of graphite carbon nitride photocatalysts is hampered by their low specific surface areas, few active sites, and low photogenerated electron-hole transfer rates. Here, we report a green and controllable strategy for synthesizing kelp-like carbon nitride nanosheets through self-assembled materials prepared from melamine and trithiocyanuric acid using sonochemistry. The prepared carbon nitride nanosheets showed superior and long-lasting photocatalytic activity in hydrogen evolution and the degradation of tetracycline hydrochloride. The significantly enhanced photocatalytic performance of carbon nitride nanosheets is attributed to the curled porous nanosheet structure and the appropriate amount of O-doping. This work provides a new design strategy for preparing shape-controlled carbon nitride catalysts via a green, fast, sonochemically mediated self-assembly approach.
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Affiliation(s)
- Anran Zhang
- College of Science, Hainan University, Haikou 570228, PR China
| | - Yang Guo
- College of Science, Hainan University, Haikou 570228, PR China
| | - Hao Xie
- College of Science, Hainan University, Haikou 570228, PR China
| | - Yangping Zhang
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China
| | - Yunzhi Fu
- College of Science, Hainan University, Haikou 570228, PR China.
| | - Changqing Ye
- Jiangsu Key Laboratory for Environmental Functional Materials, Institute of Chemistry, Biology and Materials Engineering, Suzhou University of Science and Technology, Suzhou 215009, PR China.
| | - Yukou Du
- College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, PR China.
| | - Mingshan Zhu
- School of Environment, Jinan University, Guangzhou 510632, PR China
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11
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Preparation and characterization of M1-Nx-Cy based single atom catalysts for environmental applications. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.108050] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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12
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Meng P, Brock A, Wang X, Xu Y, McMurtrie J, Xu J. Competition of Hydrogen Bonds and Coordinate Bonds Induces a Reversible Crystal Transformation. Inorg Chem 2022; 61:2086-2092. [PMID: 35050601 DOI: 10.1021/acs.inorgchem.1c03291] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Achieving reversible molecular crystal transformation between coordinate aggregates and hydrogen bonded assemblies has been a challenging task because coordinate bonds are generally much stronger than hydrogen bonds. Recently, we have reported the incorporation of silver ions into the cyanuric acid-melamine (CAM) network, resulting in the formation of a 1D coordination polymer (crystal 1) through forming the κ1N-Ag-κ2N coordination bonds. In this work, we find crystal 1 will undergo reversible transformation to hydrogen bonded coordinate units (crystal 2) through the breaking of coordinate chains and then the addition of CAM hydrogen bonding motifs into the framework. Crystal 2 presents a pseudohexagonal arrangement comprised of the κ1N-Ag-κ2N units connected by two sets of the triple hydrogen bonds, which extends two-dimensionally and stacks into a layer-structured crystal. Light was shed on the tautomerization of CA and M ligands associated with the crystal transformations using single crystal X-ray diffraction and infrared spectroscopy by analyzing the bond lengths and vibrations. We also highlight that photoluminescence can be a useful tool to probe the tautomer conversions of conjugated molecules. Furthermore, crystal 1 demonstrates high flexibility and can be bent over 180° and recover to its original shape after stress release. Crystal 2, on the contrary, is brittle and shows distinct mechanical anisotropy along different crystal orientations, as unveiled by nanoindentation measurements. The elastic modulus is well correlated with the chemical bonding strength along each orientation, and it is noteworthy that the contribution of the triple hydrogen bonds is comparable to that of the coordination bonds.
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Affiliation(s)
- Peng Meng
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, Queensland 4000, Australia
| | - Aidan Brock
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, Queensland 4000, Australia
| | - Xiaodong Wang
- Central Analytical Research Facility, Institute for Future Environments, Queensland University of Technology, Brisbane, Queensland 4000, Australia
| | - Yanan Xu
- Central Analytical Research Facility, Institute for Future Environments, Queensland University of Technology, Brisbane, Queensland 4000, Australia
| | - John McMurtrie
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, Queensland 4000, Australia
| | - Jingsan Xu
- School of Chemistry and Physics and Centre for Materials Science, Queensland University of Technology, Brisbane, Queensland 4000, Australia
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13
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Wan L, Chen Y, Zhang Y, Peng X, Chen S, Jia L. Construction and structural transformation of two coordination sphere supramolecular isomers based on Co( ii) and 4-(2-pyridyl)-NH-1,2,3-triazole via one-pot synthesis. CrystEngComm 2022. [DOI: 10.1039/d2ce01069k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two coordination sphere supramolecular isomers based on Co(ii) have been obtained via one-pot synthesis. The structural transformation process has been investigated with the help of mass spectroscopy and theoretical calculations.
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Affiliation(s)
- Li Wan
- Key Laboratory for Green Chemistry Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, PR China
| | - Yunzhou Chen
- Key Laboratory for Green Chemistry Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, PR China
| | - Yuexing Zhang
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Xu Peng
- Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, College of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, P. R. China
| | - Sihuai Chen
- Key Laboratory for Green Chemistry Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, PR China
| | - Lihui Jia
- Key Laboratory for Green Chemistry Process of Ministry of Education, School of Chemistry and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430073, PR China
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14
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Sun J, Dai L, Yao F, Zhao H, Bi J, Xue W, Deng J, Fang C, Fu Y, Zhu J. Poly (triazine imide) ligand based 2D metal coordination polymers: Design, synthesis and application in electrocatalytic water oxidation. Electrochim Acta 2022. [DOI: 10.1016/j.electacta.2021.139463] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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15
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Jiang J, Zhai J, Kong L, Zhao D, Feng Y. Flame retardant chloroprene rubbers with high tensile strength and elongation at break via dual cross-linked networks. RSC Adv 2022; 12:27633-27640. [PMID: 36276053 PMCID: PMC9516371 DOI: 10.1039/d2ra05389f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Accepted: 09/21/2022] [Indexed: 11/21/2022] Open
Abstract
The tensile strength and elongation at break of rubbers are mutually restrictive factors. Design and preparation of chloroprene rubber (CR) with high tensile strength, high elongation at break and excellent flame retardancy at the same time is challenging. Melamine cyanurate (MCA) is for the first time discovered to be a reactive flame retardant for CR. The tensile strength of C-M36 (with 3 wt% ZnO and 36 wt% MCA) vulcanizate is 2.5 times that of C-M0 (only with 3 wt% ZnO) vulcanizate, while the elongation at break of C-M36 vulcanizate is 1.3 times that of ZnO cross-linked C-M0 vulcanizate. At the same time, the limiting oxygen index of C-M36 (39%) is 1.22 times that of C-M0 (32%). FTIR and the vulcanization tests confirm that the reaction between CR and cyanuric acid occurs under the catalysis of a base (melamine), and the cyanuric acid molecules are grafted onto the molecular chain of CR. Two types of crosslinking networks are formed in CR vulcanizate, namely the traditional covalent bond crosslinks and the triple hydrogen crosslinks formed between cyanuric acid and melamine. Thus, the flame-retardant CR/MCA vulcanizate with high strength and high elongation at break is obtained. This research will strongly promote the industrial application of CR. Melamine cyanurate served as a reactive flame retardant crosslinker for chloroprene rubbers.![]()
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Affiliation(s)
- Jianliang Jiang
- School of Chemical Engineering and Technology, Frontiers Science Center for Synthetic Biology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Yaguan Road 135, Tianjin 300350, China
- Frontiers Science Center for Synthetic Biology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Yaguan Road 135, Tianjin 300350, China
| | - Junxue Zhai
- Key Laboratory of Rubber-Plastics of Ministry of Education/Shandong Province, School of Polymer Science & Engineering, Qingdao University of Science & Technology, 5 Zhengzhou Road, Qingdao 266042, China
| | - Lingxin Kong
- Key Laboratory of Rubber-Plastics of Ministry of Education/Shandong Province, School of Polymer Science & Engineering, Qingdao University of Science & Technology, 5 Zhengzhou Road, Qingdao 266042, China
| | - Dongqi Zhao
- Tianjin Joaboa Technology Co., Ltd, No. 24 Road, Tianjin 301609, P. R. China
| | - Yakai Feng
- School of Chemical Engineering and Technology, Frontiers Science Center for Synthetic Biology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Yaguan Road 135, Tianjin 300350, China
- Frontiers Science Center for Synthetic Biology, Key Laboratory of Systems Bioengineering (Ministry of Education), Tianjin University, Yaguan Road 135, Tianjin 300350, China
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16
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Chen L, Yang S, Qi W, Zhang Q, Zhu J, Zhao P. Supramolecular Self-Assembly of Nitrogen-Deficient Ag/g-C 3N 4 Nanofiber Films with Enhanced Charge Transfer Dynamics for Efficient Visible-Light Photocatalytic Activity. ACS APPLIED MATERIALS & INTERFACES 2021; 13:49993-50004. [PMID: 34643080 DOI: 10.1021/acsami.1c15321] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Molecular self-assembly of organic molecules through noncovalent interactions is a powerful strategy for designing functional materials. Herein, we fabricated a novel free-standing Ag/g-C3N4 nanofiber (Ag/CNNF) film via a water-based molecular engineering approach followed by pyrolysis using a cyanuric acid-melamine complex as the precursor. Uniform dispersion of plasmonic Ag nanoparticles and incorporation of nitrogen vacancies were synchronously introduced into the 3D highly interconnected porous CNNF framework. The resulting Ag/CNNF film with multilevel interlayer spacing distributions significantly expedited more sufficient charge transfer dynamics not only at Schottky junction sites but also throughout hierarchical CN by exciton dissociation. Benefiting from the synergistic enhancement in visible light harvesting capability and steered charge carrier transfer in a longitudinal direction, the Ag/CNNF film presented remarkably boosted photocatalytic ability both for hydrogen production and tetracycline degradation. The optimal Ag/CNNF-2 film exhibited a prominent photocatalytic hydrogen evolution rate of 1240 μmol g-1 h-1 without the Pt co-catalyst under visible light illumination, which was 10.3 times as high as that of bulk g-C3N4. Significantly, 1D Ag/g-C3N4 nanofibers self-assembled into an ordered and macroscopic film, which was more favorable in practical applications owing to good reusability and high processability. This work paved the way for the facile preparation of supramolecular self-assembled CN-based film photocatalysts.
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Affiliation(s)
- Lin Chen
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Sudong Yang
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
- Laboratory of Environmental Science and Technology, The Xinjiang Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Urumqi 830011, China
| | - Wensheng Qi
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Qian Zhang
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Jie Zhu
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
| | - Peng Zhao
- Institute for Advanced Study, Chengdu University, Chengdu 610106, China
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17
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Liu J, Yu Y, Wang C, Shen J, Feng J, Qi W. Fabrication of a chiral luminescent hydrogel from gold nanoclusters via molecular recognition. Chem Commun (Camb) 2021; 57:10202-10205. [PMID: 34522926 DOI: 10.1039/d1cc04011a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A novel supramolecular chiral hydrogel with enhanced emission was obtained by the co-assembly of achiral thiobarbituric acid-modified gold nanoclusters (TBA-AuNCs) with chiral histidine molecules. Chirality transfer from histidine to the supramolecular hydrogels was achieved through the π-π stacking and intermolecular H-bonding based on molecular recognition. This work gives a creative strategy for the building of chiral nanocluster-based materials.
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Affiliation(s)
- Junxiao Liu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - You Yu
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - Chen Wang
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - Jinglin Shen
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - Jin Feng
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
| | - Wei Qi
- School of Chemistry and Chemical Engineering, Qufu Normal University, Qufu, 273100, China.
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18
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Shen J, Bi Y, Zhang H, Xu L, Feng J, Qi W. A sensitive chemosensor for nitro-containing compounds based on Au nanoclusters/Ba2+ co-assembly system: The crucial role of ligands to metal charge transfer. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.127160] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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19
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Synergistic effects of Ag-doped and morphology regulation of graphitic carbon nitride nanosheets for enhanced photocatalytic performance. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114772] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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20
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Mo Z, Di J, Yan P, Lv C, Zhu X, Liu D, Song Y, Liu C, Yu Q, Li H, Lei Y, Xu H, Yan Q. An All-Organic D-A System for Visible-Light-Driven Overall Water Splitting. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2003914. [PMID: 33169530 DOI: 10.1002/smll.202003914] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 09/25/2020] [Indexed: 06/11/2023]
Abstract
Direct water splitting over photocatalysts is a prospective strategy to convert solar energy into hydrogen energy. Nevertheless, because of the undesirable electron accumulation at the surface, the overall water-splitting efficiency is seriously restricted by the poor charge separation/transfer ability. Here, an all-organic donor-acceptor (D-A) system through crafting carbon rings units-conjugated tubular graphitic carbon nitride (C-TCN) is proposed. Through a range of characterizations and theoretical calculations, the incorporation of carbon rings units via continuous π-conjugated bond builds a D-A system, which can drive intramolecular charge transfer to realize highly efficient charge separation. More importantly, the tubular structure and the incorporated carbon rings units cause a significant downshift of the valence band, of which the potential is beneficial to the activation for O2 evolution. When serving as photocatalyst for overall water splitting, C-TCN displays considerable performance with H2 and O2 production rates of 204.6 and 100.8 µmol g-1 h-1 , respectively. The corresponding external quantum efficiency reaches 2.6% at 405 nm, and still remains 1.7% at 420 nm. This work demonstrates that the all-organic D-A system conceptualized from organic solar cell can offer promotional effect for overall water splitting by addressing the charge accumulation problem rooted in the hydrogen evolution reaction.
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Affiliation(s)
- Zhao Mo
- School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, P. R. China
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Jun Di
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Pengcheng Yan
- School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Chade Lv
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Xingwang Zhu
- School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Daobin Liu
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
| | - Yanhua Song
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, P. R. China
| | - Chuntai Liu
- Key Laboratory of Materials Processing and Mold, Ministry of Education, Zhengzhou University, Zhengzhou, 450002, P. R. China
| | - Qing Yu
- School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Huaming Li
- School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Yucheng Lei
- School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Hui Xu
- School of Materials Science and Engineering, Institute for Energy Research, Jiangsu University, Zhenjiang, 212013, P. R. China
| | - Qingyu Yan
- School of Materials Science and Engineering, Nanyang Technological University, Singapore, 639798, Singapore
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21
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Meng P, Xu Y, Yan C, Xu J. One-Minute Synthesis of a Supramolecular Hydrogel from Suspension-Gel Transition and the Derived Crystalline, Elastic, and Photoactive Aerogels. ACS APPLIED MATERIALS & INTERFACES 2020; 12:53125-53133. [PMID: 33169961 DOI: 10.1021/acsami.0c16009] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Solutions or sols are commonly employed as the starting materials for the preparation of supramolecular hydrogels; however, suspension-based synthesis has been much less reported because of inhomogeneity and quick sedimentation of large particles in a suspension. Further, it remains a technical challenge to derive supramolecular aerogels directly from the parental hydrogels owing to the ease of structural collapse during water removal. Herein, we report a suspension-gel transition for the ultrafast synthesis of a new supramolecular hydrogel simply by adding AgNO3 into the aqueous suspension of cyanuric acid-melamine (CAM) aggregates. With the activation of preadded ammonia, Ag ions instantly reacted with the CAM particles, transforming into N-Ag(I)-N coordinating bonded supramolecular nanofibers; simultaneously, the suspension converted to a hydrogel without the use of polymer cross-linkers or external stimulus. Upon simple freeze-drying, a highly crystalline fibrous aerogel with a cellular network was obtained, which possessed a porosity up to 99.7% and a density as low as 4.8 mg/cm3, enabling remarkable oil uptake capacities (100 times of its weight). The supramolecular aerogel demonstrated intrinsic elasticity, which should arise from the cellular structure and elastic character of the nanofiber skeletons. Notably, the aerogel showed high compatibility to incorporate a range of external substances for further functionalization exemplified by polymeric carbon nitride (PCN, a metal-free semiconductor) included gels. The loaded PCN resulted in enhanced mechanical strength and endowed the aerogel unique photoactivity, i.e., in situ reducing Ag(I) into Ag nanoparticles upon light illumination and thus forming a plasmonic shell over the aerogel with potential applications in sensing and catalysis.
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Affiliation(s)
- Peng Meng
- School of Chemistry and Physics, Queensland University of Technology, Brisbane QLD 4000, Australia
| | - Yanan Xu
- Institute for Future Environments, Queensland University of Technology, Brisbane QLD 4000, Australia
| | - Cheng Yan
- School of Mechanical Medical and Process Engineering, Queensland University of Technology, Brisbane QLD 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane QLD 4000, Australia
| | - Jingsan Xu
- School of Chemistry and Physics, Queensland University of Technology, Brisbane QLD 4000, Australia
- Centre for Materials Science, Queensland University of Technology, Brisbane QLD 4000, Australia
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22
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Choi H, Baek K, Toenjes ST, Gustafson JL, Smith DK. Redox-Responsive H-Bonding: Amplifying the Effect of Electron Transfer Using Proton-Coupled Electron Transfer. J Am Chem Soc 2020; 142:17271-17276. [PMID: 32981317 DOI: 10.1021/jacs.0c07841] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
A new strategy to create highly redox-responsive H-bond dimers based on proton-coupled electron transfer is proposed that capitalizes on the importance of secondary H-bonds in determining overall binding strength in H-bond dimers. Electron transfer induced proton transfer across a H-bond can be used to significantly strengthen the overall binding by both creating strong ionic H-bonds and changing the secondary H-bonds from unfavorable to favorable. The viability and potency of this approach are demonstrated with an electroactive DAD (A = H-acceptor, D = H-donor) array, H(MQ+)H, paired with an electroinactive ADA array, O(NH)O. NMR titration of H(MQ+)H with O(NH)O in 0.1 M NBu4PF6/CD2Cl2 gives a Kassoc of 500 M-1, typical of DAD-ADA dimers. However, upon two-electron reduction in 0.1 M NBu4PF6/CH2Cl2, cyclic voltammetry studies indicate a 1.8 × 105 increase in binding strength, corresponding to a very large Kassoc of 9 × 107 M-1. The latter value is typical of DDD-AAA H-bond dimers, consistent with proton transfer across the central H-bond upon reduction.
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Affiliation(s)
- Hyejeong Choi
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182-1030, United States
| | - Kiyeol Baek
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182-1030, United States
| | - Sean T Toenjes
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182-1030, United States
| | - Jeffrey L Gustafson
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182-1030, United States
| | - Diane K Smith
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182-1030, United States
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